MAC Address question for TI Hercules MCU

Christopher Sam Soon

I am currently browsing the code for lwip port for the Hercules MCU. I am seeing that the MAC address is programmed to a specific value on all 8 channels {hdkif.c, line 434}. My understanding is that all 8 channels will only accept packets if they are targeted to that specific address.

However, ARP protocol requires ethernet devices to listen on MAC address FF FF FF FF FF FF. How is this then done ? Can it be that one of the channels' MAC address is set to FF FF FF FF FF FF later on for ARP ?

I tried reading the technical reference manual, but did not find anything on this.

Thanks!

Christopher

over 13 years ago

0 Christopher Sam Soon over 13 years ago

Prodigy 190 points

Hi,

I solved the question. The channels have the ability to accept broadcast packets (FF FF FF FF FF FF) (Set in hdkif.c, line 429) In the current implementation, channel 0 is set to accept broadcast packets.

Another question. Since all 8 channels have the same MAC address, which one of them will actually receive the packet when a packet arrives at the port ?

Thanks !

Christopher

0 Zhaohong Zhang over 13 years ago in reply to Christopher Sam Soon

TI__Mastermind 22715 points

Christopher,

The packet will go the channel with highest priority at the moment.

Thanks and regards,

Zhaohong.

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MAC Address question for TI Hercules MCU